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[java] How do I enable index downloads in Eclipse for Maven dependency search?

I am using Eclipse Luna with the m2e plug-in. When I search for dependencies, I get the following warning (also see the screenshot after):

Index downloads are disabled, search result may be incomplete.

enter image description here

How can I enable index downloads?

This question is related to java eclipse maven

The answer is

In Eclipse, click on Windows > Preferences, and then choose Maven in the left side.
Check the box "Download repository index updates on startup".
- Optionally, check the boxes Download Artifact Sources and Download Artifact JavaDoc.
Click OK. The warning won't appear anymore.
Restart Eclipse.

Tick 'Full Index Enabled' and then 'Rebuild Index' of the central repository in 'Global Repositories' under Window > Show View > Other > Maven > Maven Repositories, and it should work.

The rebuilding may take a long time depending on the speed of your internet connection, but eventually it works.

Source: Stackoverflow.com

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